tentukan nilai x,y,z dari 3x+4y-5z= 12, 2x+5y=17 , 6x-2y+3z=17

3x + 4y -5z = 12 | x3
6x - 2y + 3z = 17 | x5
—————————
9x + 12y - 15z = 36
30x -10y +15z = 85
__________________ +
39x + 2y = 121

39x + 2y = 121 | x5
2x + 5y = 17 | x2
______________
195x + 10y = 605
4x + 10y = 34
________________-
191x = 571
x = 2 189/571